tracing: Fix desc in error path for the trace remote test module

During initialisation in remote_test_load(), if one of the
simple_ring_buffer fails to initialise, the error path attempts to
rollback initialised buffers. However, the rollback incorrectly uses the
global pointer to the trace descriptor, which is only set upon
successful load completion. Fix the error path by using the local
pointer to the descriptor.

Link: https://patch.msgid.link/20260515201616.337469-1-vdonnefort@google.com
Fixes: ea908a2 ("tracing: Add a trace remote module for testing")
Reported-by: Sashiko <sashiko-bot@kernel.org>
Signed-off-by: Vincent Donnefort <vdonnefort@google.com>

base-commit: 5d69190
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

Author: vdonnefort

kernel/trace/remote_test.c

@@ -110,9 +110,9 @@ static struct trace_buffer_desc *remote_test_load(unsigned long size, void *unus
 	return remote_test_buffer_desc;
 
 err_unload:
-	for_each_ring_buffer_desc(rb_desc, cpu, remote_test_buffer_desc)
+	for_each_ring_buffer_desc(rb_desc, cpu, desc)
 		remote_test_unload_simple_rb(rb_desc->cpu);
-	trace_remote_free_buffer(remote_test_buffer_desc);
+	trace_remote_free_buffer(desc);
 
 err_free_desc:
 	kfree(desc);